Shared Random Access Resources for Operator Preamble Differentiation
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Solution Overview
Problem
In wireless communication systems with spectrum sharing between multiple operators, there is complexity in initial access due to difficulty in differentiating random access preambles associated with different operators, leading to resource duplication and overhead.
Innovation Solution
A UE and network node are configured to transmit and receive random access messages with operator-specific indications, using shared random access resources to reduce ambiguity and overhead.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If random access resources are shared between multiple operators, then spectral efficiency is improved, but difficulty in differentiating operator-specific preambles increases
Solution Approach 1:
The random access resources are segmented into operator-specific portions through resource partitioning. Each operator is allocated specific time-frequency resources or preamble sequences within the shared random access channel, enabling clear differentiation while maintaining overall resource sharing. This segmentation allows UEs to identify operator-specific preambles without requiring separate dedicated resources for each operator.
2Difficulty of detecting and measuring
If separate random access resources are allocated to each operator, then preamble differentiation is simplified, but resource overhead increases
Solution Approach 1:
Multiple operators' random access resources are merged into a shared random access channel structure. Instead of allocating completely separate resources for each operator, the patent combines operator-specific logical identifiers with shared physical resources, allowing multiple operators to coexist in the same time-frequency space while maintaining distinguishability through higher-layer signaling and preamble sequence assignment.
3Loss of information
If operator-specific indications are added to random access messages, then ambiguity is reduced, but message complexity increases
Solution Approach 1:
An intermediary operator identifier field is introduced in the random access message structure, which acts as a mediator between the shared physical resources and the operator-specific logical channels. This intermediary element carries operator identification information without fundamentally restructuring the entire message format, thereby reducing ambiguity while limiting complexity increase to a manageable addition.
Data Source
AI summary
Aspects of the present disclosure relate generally to initial access in shared spectrum. Some aspects more specifically provide shared preamble resources for user equipments (UEs) subscribing to different operators to access shared spectrum. For example, a UE may receive an indication, associated with a first operator, of random access resources. In some examples, the random access resources may be shared between the first operator and the second operator. The UE may transmit a first random access message on a random access resource of the random access resources. Aspects described herein also provide differentiation of random access messages as associated with a first operator or a second operator when a random access preamble has been transmitted on a shared random access resource.